I just saw the Power Crystals in Magic of Eberron for the first time. These incredible items are warforged components that can allow a psionic warforged to manifest a specific psionic power once per day, using their own power points. So they're like Rune Staffs, but only hold a single power each. They're also incredibly cheap (400 gp for a 1st level one). 'Forged were already one of my favorite races for psions, and they just got better. Probably the best part: it doesn't say it has to be on your list.
Pricing:
1st (400), 2nd (1600), 3rd (3600), 4th (6400), 5th (10000), 6th (14,400), 7th (19,200), 8th (25,600), 9th (32,400)